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401. COS Instrument Handbook
COS Instrument Handbook for Cycle 24 . ... Cosmic Origins SpectrographInstrument Handbook for Cycle 24 > Chapter 1: An Introduction to COS > 1.3 COS Quick Reference Guide . ... Table 1.1: COS Instrument Characteristics . ... FUV channel . NUV channel . ... 0.11 arcsec per pixel . 1.1 arcsec per resel . ... 23.5 mas per pixel . 70.5 mas per resel . ... 0.171 arcsec per resel . ... Table 1.2: COS Detector Characteristics . ... 2.77 cnt s ?1 cm ?2 . ... Table 1.4: Useful Figures and Tables . ...
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402. COS Instrument Handbook
COS Instrument Handbook for Cycle 24 . ... Cosmic Origins SpectrographInstrument Handbook for Cycle 24 > Chapter 2: Special Considerations for Cycle 24 > 2.3 Time-Dependent Sensitivity Changes . 2.3 . Time-Dependent Sensitivity Changes . During Cycle 17 the throughputs of some COS modes?the bare-aluminum NUV G225M and G285M gratings and the FUV channels?were found to be declining with time significantly more rapidly than had been expected. ...
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403. COS Instrument Handbook
COS Instrument Handbook for Cycle 24 . ... Cosmic Origins SpectrographInstrument Handbook for Cycle 24 > Chapter 2: Special Considerations for Cycle 24 > 2.2 COS Observations Below 1150 е: Resolution and Wavelength Calibration Issues . ... COS Observations Below 1150 е: Resolution and Wavelength Calibration Issues . ... In such cases, for each CENWAVE and FP-POS position, a separate GO-wavecal exposure should be taken with Segment A ?on? immediately adjacent to the Segment B science observations. ...
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404. COS Instrument Handbook
COS Instrument Handbook for Cycle 24 . ... Cosmic Origins SpectrographInstrument Handbook for Cycle 24 > Chapter 2: Special Considerations for Cycle 24 > 2.1 COS FUV Detector Lifetime Positions . ... Prolonged exposure to light causes the COS FUV detectors to become less efficient at photon-to-electron conversion, a phenomenon called ?gain sag?. ... STScI is undertaking a number of actions to mitigate the effects of gain sag and extend the lifetime of the COS FUV XDL detector. ...
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405. COS Instrument Handbook
COS Instrument Handbook for Cycle 24 . ... Cosmic Origins SpectrographInstrument Handbook for Cycle 24 > Chapter 2: Special Considerations for Cycle 24 . Chapter 2: . Special Considerations for Cycle 24 . 2.1 COS FUV Detector Lifetime Positions . 2.2 COS Observations Below 1150 е: Resolution and Wavelength Calibration Issues . ... 2.6 SNAP, TOO, and Unpredictable Source Programs with COS . 2.7 Should I Use COS or STIS? ...
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406. COS Instrument Handbook
COS Instrument Handbook for Cycle 24 . ... Cosmic Origins SpectrographInstrument Handbook for Cycle 24 > Chapter 1: An Introduction to COS . Chapter 1: . An Introduction to COS . ... 1.2 Observing with COS . ... 1.2.2 Observing Modes: Spectroscopic and Imaging . 1.2.3 Observing Modes: TIME-TAG and ACCUM . 1.2.4 Typical Observing Sequences . 1.3 COS Quick Reference Guide . 1.4 COS FAQ . 1.5 Purpose of this Handbook . ...
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407. COS Instrument Handbook
COS Instrument Handbook for Cycle 24 . ... Cosmic Origins SpectrographInstrument Handbook for Cycle 24 > Chapter 1: An Introduction to COS > 1.2 Observing with COS . ... 1.2.2 Observing Modes: Spectroscopic and Imaging . 1.2.3 Observing Modes: TIME-TAG and ACCUM . ... COS provides two observing modes, TIME-TAG and ACCUM . ... ACCUM mode is designed for observations of targets that are too bright for TIME-TAG mode. ... Both TIME-TAG and ACCUM modes may be used with either the FUV or NUV channel. ...
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408. COS Instrument Handbook
COS Instrument Handbook for Cycle 24 . ... Cosmic Origins SpectrographInstrument Handbook for Cycle 24 > Chapter 1: An Introduction to COS > 1.1 Overview . ... The Cosmic Origins Spectrograph (COS) was installed on the Hubble Space Telescope (HST) in May 2009. Working at far-ultraviolet wavelengths, COS was designed to study the origins of large-scale structure in the Universe, the formation and evolution of galaxies, the origin of stellar and planetary systems, and the cold interstellar medium. ...
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409. COS Instrument Handbook
COS Instrument Handbook for Cycle 24 . ... Cosmic Origins SpectrographInstrument Handbook for Cycle 24 > Chapter 11: Data Products and Data Reduction > 11.3 Additional COS Files . 11.3 . Additional COS Files . Several additional files are used in the processing of COS data. ... For a full description of these and other files, see the COS Data Handbook . ...
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410. COS Instrument Handbook
COS Instrument Handbook for Cycle 24 . ... Cosmic Origins SpectrographInstrument Handbook for Cycle 24 > Chapter 11: Data Products and Data Reduction > 11.2 COS Data Files . ... COS Data Files . ... For FUV data, there will be two raw files for each exposure, one file for Segment A and one for Segment B. For NUV data, there will be one raw file for each exposure. ... There is a ?corrtag? file (the file name contains the string ? corrtag ?) containing a corrected events table. ...
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411. COS Instrument Handbook
COS Instrument Handbook for Cycle 24 . ... Cosmic Origins SpectrographInstrument Handbook for Cycle 24 > Chapter 11: Data Products and Data Reduction > 11.1 Overview . 11.1 . Overview . Raw COS data are processed through the STScI Data Processing pipeline. Data first undergo Generic Conversion, by which bits from individual exposures are unpacked and combined into files containing raw, uncalibrated data. ...
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412. COS Instrument Handbook
. COS Instrument Handbook for Cycle 24 . help@stsci.edu . Cosmic Origins SpectrographInstrument Handbook for Cycle 24 > Chapter 11: Data Products and Data Reduction . Chapter 11: . Data Products and Data Reduction . 11.1 Overview . 11.2 COS Data Files . 11.3 Additional COS Files . Cosmic Origins SpectrographInstrument Handbook for Cycle 24 > Chapter 11: Data Products and Data Reduction .
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413. COS Instrument Handbook
COS Instrument Handbook for Cycle 24 . ... Cosmic Origins SpectrographInstrument Handbook for Cycle 24 > Chapter 7: Exposure-Time Calculator (ETC) > 7.6 Examples . ... 7.6.1 A Flat-Spectrum Source . 7.6.2 An Early-Type Star . ... We enter these values into the spectroscopic ETC, select the Primary Science Aperture (PSA), select ?Exposure time needed to obtain a S/N ratio of 10.0?, enter the specified wavelength of 1320 е, and select ?Point Source? as the source type. ...
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414. COS Instrument Handbook
COS Instrument Handbook for Cycle 24 . ... Cosmic Origins SpectrographInstrument Handbook for Cycle 24 > Chapter 7: Exposure-Time Calculator (ETC) > 7.5 Extinction Correction . ... Extinction Correction . ... A V values applicable to our Galaxy, taken from Cardelli, Clayton, & Mathis (1989, ApJ, 345, 245) assuming R V = 3.1. ... The ETC allows the user to select among a variety of extinction curves and to apply the extinction correction either before or after the input spectrum is normalized. ...
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415. COS Instrument Handbook
COS Instrument Handbook for Cycle 24 . ... Cosmic Origins SpectrographInstrument Handbook for Cycle 24 > Chapter 7: Exposure-Time Calculator (ETC) > 7.4 Detector and Sky Backgrounds . ... 7.4.3 Zodiacal Light . ... The primary background sources that affect COS observations are detector dark count, earthshine, zodiacal light, and airglow emission; neither of the COS detectors suffers from read noise. ... 4.3 / 4.5 per cm 2 . ... Zodiacal light levels range between m V = 22.1 and 23.3 mag arcsec -2. ...
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416. COS Instrument Handbook
COS Instrument Handbook for Cycle 24 . ... Cosmic Origins SpectrographInstrument Handbook for Cycle 24 > Chapter 7: Exposure-Time Calculator (ETC) > 7.3 Sensitivity, Count Rate, and S/N . 7.3 . Sensitivity, Count Rate, and S/N . A complete theoretical discussion of the exposure time as a function of instrument sensitivity and signal-to-noise ratio is given in Chapter 6 of the STIS Instrument Handbook and will not be repeated here. ... B det = the detector dark count rate, in count s ? ...
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417. COS Instrument Handbook
COS Instrument Handbook for Cycle 24 . ... Cosmic Origins SpectrographInstrument Handbook for Cycle 24 > Chapter 7: Exposure-Time Calculator (ETC) > 7.2 Imaging Observations of Red Objects . 7.2 . Imaging Observations of Red Objects . As shown in Figure 6.3 , the COS NUV channel is sensitive to wavelengths above 3200 е, an important consideration when imaging red objects. ... This message indicates that the ETC may return incorrect results due to the incomplete source spectrum. ...
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418. COS Instrument Handbook
COS Instrument Handbook for Cycle 24 . ... Cosmic Origins SpectrographInstrument Handbook for Cycle 24 > Chapter 7: Exposure-Time Calculator (ETC) > 7.1 The COS Exposure Time Calculators . 7.1 . The COS Exposure Time Calculators . To help with proposal preparation, four COS Exposure Time Calculators (ETCs) are available on the STScI ETC webpage: . ... The target-acquisition ETCs return the acquisition exposure time to be entered in APT for both imaging and spectroscopic acquisitions. ...
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419. COS Instrument Handbook
COS Instrument Handbook for Cycle 24 . ... Cosmic Origins SpectrographInstrument Handbook for Cycle 24 > Chapter 7: Exposure-Time Calculator (ETC) . Chapter 7: . Exposure-Time Calculator (ETC) . 7.1 The COS Exposure Time Calculators . ... 7.4 Detector and Sky Backgrounds . ... 7.4.5 Tabular Sky Backgrounds . ...
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420. ACS Reference Files
... File . ... t3n1116mj_a2d.fits . WFC . ... Jan 01 2008 00:00:00 UT . GROUND . ... Mar 23 2009 11:22:03 GMT . ... WFC A2D file FITS (Flexible Image . ... AC . ... kcb1734ij_a2d.fits . ... Jan 01 1992 00:00:00 UT . ... Dec 13 2000 13:34:16 GMT . ... Initial delivery of HRC A2D table . ... kcb1734hj_a2d.fits . ... Jan 01 1991 00:00:00 UT . ... Initial delivery of WFC A2D table . ... j4d1435hj_a2d.fits . ... Apr 14 1999 20:17:02 GMT . ... Test reference file for integrated . ...
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